Ousmane Diomande helped Ivory Coast reach the World Cup knockout stages for the first time [Getty Images]Nottingham Forest are close to completing a deal for Sporting Lisbon defender Ousmane Diomande.The 22-year-old is viewed as a key target for new Forest boss Oliver Glasner, and talks have progressed in recent days.While a final agreement still needs to be reached, sources indicate a deal between the clubs is now close, with discussions at an advanced stage.Diomande has a £68.2m release